The wild Hamadryas baboons of Ethiopia have a friend in biologist Mat Pines, they even pick the nits from his hair. He's been studying and living with them for five years in the remote and arid Awash National Park. Now in his final year, we follow the fortunes of his favourite baboon, Critical, as he tries to find a family and fend off his aggressive male rivals. But the local gun-toting Afar tribe have a traditional hatred of the baboons. Before Mat leaves, he hopes to broker a peace between the baboons and the tribe.